var foto = new Array(); 

foto[0] = '<td width=325 height=680 align=left valign=bottom background=/imagens/foto_home01.jpg>';
foto[1] = '<td width=325 height=680 align=left valign=bottom background=/imagens/foto_home02.jpg>';
foto[2] = '<td width=325 height=680 align=left valign=bottom background=/imagens/foto_home03.jpg>';

if(eval('foto').length > 1){
	do{
		varRandom = eval(Math.round(Math.random() * (eval('foto').length + 1)));
	}while(varRandom >= eval('foto').length)
}else{ 
	varRandom = 0; 
} 
function FN_ExibirFoto(){ 
	varRandom = eval('varRandom'); 
	var imprimir = eval('foto')[varRandom]; 
	if(imprimir){document.write(imprimir);}
} 							  
FN_ExibirFoto();